Heel-nailing machine



J. T'. LANCASTER, EEEEEE IL ING MACHINE.

APPLICA MAY 6, 1918. 1,395,838. Patented Nov. 1, 1921.

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' /NVE/vro 79 .7077771212 almas/l* A TTUH/VEY J. LANCASTER. HEEL NAILING MACHINE.

APPLICATION FILED MAY 61.1918. 1,395,838-, PatenteaNov. 1,1921.

6 SHEETS-SHEET 2- y INVENTR I i nJZL'anca's/er' J. T. LANCASTER.

HEEL NAILING MACHINE.

APPLICATION .FILED MAY 6. |918.

Patented Nov. 1,1921;- v

6 SHEETS-SHEET 3.

INVENToR -Jbn ZZoncas/ef l Ewa/WL A ATTORNEY J. T; LANCAST HEEL NAILING MACHINE.

APPLICATION FILED MAY s, 1918.

70 INvENToR l`J07777 loncaS/r ATTORNEY 1. 1T. LANcAsi-m.

HEEL NAILING MACHINE. nPPLlcAloN FILED MAY e. |9181 10395;,838v Patented Nov. 1, 1921v` 6 SHEETS-SHEET 5- /Nl/E/von .70.7777 7.7L ance/afer' Uran/vn J. T. LANCAS HEEL NAILING MACHINE. APPLICATION FILED MAY6,1913.`

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JOHN T. LANCASTER, OF HAVERHILL, MASSACHUSETTS, ASSIGNOR T0 HAMEL SHOE MACHNERY COMPANY, A CGRPORATON OF :MASSACHUSETTS HEEL-NAILNG v-ACl-ITNE Application led May 6, 1918.

To all 'whom t may concern:

Be it known that I, JOHN T. LANCASTER, a citizen of the United States, residing at Haverhill, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Heel-Nailin'g Machines, of which the following is a speci` ication, reference being had therein to the accompanying drawings.

This invention relates to certain improvements in heel nailing machines' and particularly those of that type disclosed in the patent to Pettengill, 1,119,763, December l, 1914, in which a heel is pricked on a holder in the rear of the-jack simultaneously with the spanking of a top lift ontol the heel of a shoe supported upon the jack, the pricked heel being nailed to a shoe by a subsequent operation of the machine. Machines of the above type comprise a reciprocating cross head having mounted thereon a turret for supporting the nailing'and spanking devices, the turret being oscillatable to permit the proper presentation of the nailing and spanking devices in succession for carrying out the required sequence of operations. The machine is also provided with an awl carrier slidably mounted upon the cross head and arranged to be locked thereto for performing the pricking operation and to be unlocked therefrom and held in raised position while the nails are being driven.

The machine of the patent above referred to, while provided with means for positively locking the turret in either the nail driving or spanking positions, requires that the operator unlock and turn the turret as a manual operation between the successive nailing and spanking strokes of the cross head. The present invention'therefore comprises the provision of automatically operating devices, serving to unlock the turret, to turn and to thereafter lock the same in its new position, such devices normally operating in the first half of each downward stroke of the cross head.

As it is sometimes desirable, however, to repeat the operation of one of the devices carried ybythe turret, as for example the top lift spanker, without the normal intervening operation of the other devices, the invention contemplates the provision of manually controlled means whereby the above described automatic turret turning devices are Specification of Letters Patent.

Patented Nov. 1, 1921. sei-iai No. 232,689.

rendered inoperative during one or more successive strokes of the cross head.

In the machine of the above patent the awl carrier is positively locked to the cross head -by a slidable bolt during the pricking operation, but is unlocked therefrom in the interval bet-weon said operations. In said patent, means comprising a spring-pressed ball is provided for locking the awl carrier to thenail-plate slide holder during the intervals between said pricking operations, it being necessary in view of the non-positive action of Vsaid ball, to provide additional means to insure the proper position of the awl carrier for engagement of the bolt therewith preparatory to the next pricking stroke of the cross head.

This invention thus further consists in means comprising 'a spring-pressed bolt adapted to form a positive lock between the awl carrier and nail-plate slide holder, said bolt being automatically retracted to unlocking position upon locking movement of the bolt which locks the awl carrier to the cross head, and being automatically restored to engagingposition upon disengagement of said latter bolt.

The invention further comprises additional and desirable details of construction all of which will be hereinafter more fully described and claimed, reference being had to theaccompanying ,drawings for a full disclosure of the same and in which,-

VFigure l is a front elevation of so much only of the upper portion of a heel nailing machine as is necessary to illustrate the application of this invention thereto, the parts being shown'in the position which they occupyV just rSubsequent to the spanking operation,l the cross head being in uppermost potion,showing the mechanism at the left of Fig. @the cross head having moved slightly downward on its spanking stroke,

Fig. 6 is a view similar to Fig. 5, the cross head having moved downward to its lowermost position at theV end of the spanking stroke,

Fig. 7 is a perspective view of a bolt forming a part of the turret turning mechanism,

Fig. 3 is a sectional detail illustrating i means for operating said bolt,

Figs. 9 and 9a are detail views of a manually actuated controlling` device for said bolt, Y

Fig. f10 is a sectional detail of the latch for locking` the turret, and the means for projecting the same,

Fig. 11 is a perspective of said locking 1 indicates a portion of the vfixed frame of the machine having formed therein at 2 a guide member serving to slidably guide a rod 3, said rod being connected to and supporting at its upper end, the reciprocable cross head 5, it being understood that the rod 3 together with its guide member is duplicated at the right hand side of the ma chine, not herein shown. The lower ends of the rods 3 are connected to a lower cross head suitably guided in the base of the machine, andL which cross head is given a reciprocating motion by means of a crank and connecting rod operated from any suitable source of power, all as clearly shown in the patent to Fettengill above referred to.

The cross head 5, at its central portionV comprises front and rear plates 6 and 6, such plates being` spaced apart and having rotatably supported between them the turret 3. As herein shown the turret is fixed to a shaft 7, having journal bearings in said front and rear plates, the turret being pro vided with divergent arms 9` and 10 serving to support, at their outer extremities, a toplift holder 11 and a nail driver holder 12, respectively. A suitable handle 13 may be fixed to one of the arms of the turret for permitting manual turning of the same when V desired.

Fixed to the forward end of the shaft 7 and in front of plate 6 is a sector 141-, said sector having notches 15 and 16 formed in its edge, and beingalso provided with a crank arm 17. rlhe sectoris also furnished, at points substantially equidistant from the notches 15, 16, with outstanding lugs 1S, 19,` for a purpose to be hereinafter describedl 20 is a boss projecting from the forward face of the plate 6 adjacent said sector and having formed therein a guideway for a slidable latch member 2l (see Figs. '10 and l1), the right hand extremity of said latch member being kreduced as at 22 for ready engagement with the notches 15 and 16 of the sector 14. 23 is a cover plate secured as by means of bolts 24 to the outer face ofthe boss 20, thereby serving to retain they latch 21 in proper operative position. lllithin said cover plate at 25 is formed a longitudinal bore in which is located a compression spring 26, said compression sprinq' being adapted to` engage at one end against a pin 27 projecting forwardly from the latch 21, and having engagement at its opposite extremity with a screw 2S adjustable within a threaded portion of said bore 25, a slot 29 being formed within said cover plate to accommodate the pin 27, which is slidable therein. f F rom theabove construction, it will be evident that the latch 21 is constantly urged into engaging relation toone or the other of said notches V15, 1G ofthe sector 14;, and that the tension of` the spring which acts to project said latch may be varied at will by ,adjust- `vided adjacent the sector 14- with upper and lower hardened contact plates Y13a, 19a' adapted to receive the impact of adjustable stop belts 18h, 19h, respectively, said bolts serving to adjustably limit the arc of swinging movement of said sector. f Y

At its left hand extremity the latch 21 is provided with an extension 30, having upon its rear face a block 31. The upper yand lower surfaces of block 31 are inclined as at y32, 33 to form cams, the right hand extremities Vof said cams being connected byV a substantially vertical surface 31a, the purpose of which construction will be hereinafter made evident. 3ft is a bracket fixed -to the frame member 1 and providing a support for a fixed upwardly extending rod 35, rsaid rodv being guided near its upper extremity by passing through an openingformed ina bracket 36 depending` from the cross head 5. At the upper Vend ofthe rod 35, is pivoted, as by means of pin 37, a block 33, said block having rotatably mounted atits upper end an anti-friction roller 39 arranged for contact with the cam surfaces 32 and 33. rlhe block 38 is provided upon its right hand face with a lug 410V adapted to engage the vertical left hand surfacel of the boss 20, serving thereby to guide said bloclrduringV a portion of the downward movement of the cross head. A. fia-t spring 41, carried by the upper end of the rod 35, bears'againstthe block 3S upon its left hand face adjacent ipo the roll 39 and acts to restore the block 38 to vertical position if the same be turned in a counter-clockwise direction about its pivot.

Consideration of the structure thus far described will show that upon downward movement of the cross head, carrying with it the turret 8 and latch 21, the roll 39 which lies in the downward path of' movement of the cam 32 will contact with the latter and as the block 38 is prevented Jfrom swinging movement to the right about its pivot by engagement of lug 40 with the boss 20, the cam member 32 in moving over Said roll 39 will cause a sliding movement of latch 21 to the left, thus serving to disengage said latch from either of the notches 15, 16 with which it may have been engaged. As the cross head continues to move down, roll 39 passes up the vertical surface 31?L of the cam block 31 and finally becomes entirely disengaged from said block, the latch 21 now being free to return under action of spring 26 into engagement with either of the notches 15 or 16 which may be in position to receive it. Upon upward movement of the cross head, the roll 39 being engaged by the cam 33, will swing block 38 about its pivot 37 against action of spring 41 without causing any movement of the latch 21, the roll thus being restored to its initial position below block 31.

Pivoted at the point 42 upon the cross head is a bell crank lever 43, said lever being provided with arms` 44, 45 and .46. 47 is a crank pin projecting forwardly from the crank arm 17 of the sector 14, and being connected to the arm 44 0f the bell crank 43 by means of a link rod 48. 49 is a bracket extending outwardly from the face oi the cover plate 23, and provided with a guide opening through which passes the link 48. Surrounding said link 48 is a coil spring 50, said spring bearing at one end against the bracket 49 and at its opposite end against a nut 51 adj ustably threaded upon the link 48, whereby the tension of said spring may be varied.

52 is a vertically slidable rod guided within suitable openings in brackets 34 and 36, the lower end of said rod being provided with an extension 53 slidable in an axial bore in said rod and normally held in projected position by a relatively heavy spring, a pin 54 slidable in a slot 55 in said rod 52 serving to retain the extension 53 in proper relation to said rod 52. Formed in the bracket 34 is a transverse guide opening 56 withink which is sildably mounted a bolt 57 (see Figs. l7 and 8), the right hand extremity 58 of said bolt being normally projected across the path of y'the lower end oi said rod 52 by means of a spring 59 located within a chamber 60 in said bolt 57, said spring bearing at one extremity against the inner wall 61 of said chamber, and at its opposite extremity against a pin 62 xed in the bracket 34. The bolt v57 is `Iprovided at 62a with a slot having at 63 an inclined surface forming a` cam, said cam being arranged for engagement with a ccmplementary cam incline 64, formed upon a slidable cam member 65. Cam member 65 is slidable within suitable gideways 66 formed within the bracket 34 and is arranged to move transversely of the path of bolt 57 and to lie within slot 62a thereof. A cover plate 67 is `provided for retaining said bolt^57 and cam.member'65 in proper relative position within said guides.

Thev cam member 65 is formed with a bore 68 passing entirely through the same from end to end, and freely movable within said bore is a rod 69, saidA rod having at its lower extremity a head 70 engageable with the lower end of the cam member 65. The upper end of the rod 69 has pivotally connected thereto at the point 71a link member 72, the latter being.. pivoted at its opposite extremity 73 to the arm 46 of bell crank lever 43. The upper end of the slidable rod 52 is connnected by means of a suitable link 74 with the arm 45 of said bell crank lever 43. Adjustably secured to the rod 69 near its upper extremity is a stop member 75, said stop member being arranged to engage the upper end 76 of cam member 65 upon downward movement of said rod 69.

The bolt 57 at the point 77 is provided with an opening for the reception of a pin 78 forming a pivotal support for a manually operable lever member 79, said lever member being provided at 80 with a cam surfacearranged for engagement with the left hand face 81 of the bracket member 34.

Inthe machine as herein shown 85 is the nail-plate, 86 the nail-plate slide, 87 the nailplate slide holder, and 88 the awl carrier, all as shown in the above mentioned patent to Pettengill. As in the above mentioned patent, the present device is provided at 89 with a cam groove formed upon the turret between ,the front and rear plates of the cross head, said cam groove being arranged for operative engagement with an antifriction roll 90 carried by a bolt 91 slidably guided within suitable openings 92, 93 in said cross head and having its rear extremity arranged for locking engagement with an opening 94 in the awl carrier, whereby said awl carrier may be locked to the cross head for movement therewith.

The nail-plate slide holder 87 is provided at 95 with an opening, within which is iixed the sleeve member 96 extending outwardly from a bolt housing 97, said housing being provided at 98 with a bore adapted to guide the stem portion of the bolt 99, the head of which is slidable within and guided by the sleeve member 96. 100 is a compression spring seated within the bore 98 of member 97 and passing within a pocket 'formed in the stem of bolt 99, said spring tending` normally to project said bolt toward the free with an enlarged head having a cylindrical portion 102 slidable within the sleeve member 96, as above described,and being also slidable within the bushing 101, the outer extremity of said bolt head being conical as shown at 103, having its apex in axial alinement with opening 94.

The operation of the above described mechanism is as follows, the lparts being considered as in the initial position shown in Fig. 1, in which the cross head has just reached its uppermost position afterper- Vforming the top-lift spanking stroke, it being noted at this time that'tiic cam member 65 is up in such position as to permit the bolt 57 to vbe projected by its spring into the path of the rod 52, the latter, however, being elevated out of contact with said bolt. Y

As the cross head moves downward, the roll 3 9 immediately comes into contact with the cam 32 and causes a retraction of the latch 21, said latch being wholly retracted as shown in Fig. 2, substantially at the instant of contact of the lower extremity of the rod 52 with the top of the bolt 57, the slidable extension 53 ot said rod 52, however, providing for slight inaccuracies of the timing of these parts. Immediately upon Contact of the lower extremity ojt' rod 52 with said bolt, further downward movement of said rod 52 is prevented, thereby causing a turning movement of bell crank lever 43 about its pivot 42 as the cross head moves downward,'thus, through the link 48, acting to turn the sector 14 and therewith the turret 8, at the same time compressing the spring 50 between the bracket 49 and the nut 51.

As the turret thus turns to bring the nail driver element 12 into operative position, the bolt 91, which has previously locked the awl carrier 88 to the cross head 5, is retracted, thus freeing the awl carrier from the cross head, the bolt 99, however, at thistime moving forwardly under action of spring 100 until the cylindrical portion 102 of its head comes into engagement with the bushing 101, thereby positively locking the awl carrier to the nail-plate slide holder 87. As the downward movement of the cross head continues the turret will be turned until the latch 2l is opposite the notch 15, the roller 89 having at this time passed up by the cam-carrying messes block 31, latch 21 thus being free to move to the right under action or' its spring26 into latching engagement with said notch 15. The above movements all take place during the first half of the downward movement of the cross head, thus locking the turret in position with the nail drivers 12 in operative position for driving kthe nails, which operation takes place during the latter portion of the downward movementV of the cross head.

During the latter portion of such movement, the stopmember 7 5 contacts with the upper end of the cam member 65, and thereby positively moves the same downwardly, thus through engagement of the cam elements 64 and 63 retracting the latch'56 from below the lower extremity of the vrod 52, thereby permittingslight further downward movement of the latter into the position shown in Fig. 3, said ligure indicating the position of the parts at the end of the downward movement of the cross head for driving the nails, it being noted at this time that the members 46 and 72, Vwhich together constitute a toggle connection are in alinementt, and that the spring 50 is held under compression by engagement of the latch 21 with the notch 15'.

As the cross head now rises from the lower limit of its movement the partsvv assume the positions shown in Fig. 4. By reason, however, of the straightening of the toggle connection between the-bell crank 48 and the rod 69, the nut upon the lower extremity 100 of' the latter is not raised high enough at this time to lift the cam ymember 65 to such an extent as to permit projection of the bolt 57 into the path of the slide member 52.V

As the cross head now moves downwardly 105 from the position shown in Fig. 4 to per- Y form the top litt spanking stroke, the roll 39 again contacts with the cam 32 and retracts the latch 21V from Ythe notch 15. As the spring 50 is under compression and as 110 the member 52 is `Vnow free for downward movement, the immediate effect of such release of latch 21 from notch l5 is to cause a turning movement of the turret, sufficient to bring` the spanker block 11 into operative 115 position. This turning movement of the turret serves simultaneously to move the bolt 91 into operative engagement with the opening 94 of the awl carrier, the latter having been positively retained in fixed relation to 120 nail-plate slide holder 87 during the naildriving movement of the cross head by engagement of cylindrical portion 102 oit the bolt head with the bushing 101 as above described.

Immediately upon Contact of the rear extremity of bolt 91 'with the conical portion 103 of boltV 99, said boltV is moved backwardly against its spring 100 until the cylindrical portionv 102 of its head is removed 13,0

from Contact' with said bushing 101. i The provision of the conical portion 103 of said bolt head makes it unnecessary to move the bolt 91 through the whole thickness of the f awl carrier S8 in order to fully retract bolt 99 therefrom, as any downward movement of the. awl carrier relatively to the nailplate Slide holder.87, after such disengagement of the cylindrical portion 102 of the bolt head, will,by engagement of the interior wall of bushing 101 with the conical portion 103 of the bolt, cam the same backward tocause a complete retraction of the bolt from the awl carrier, thus providing for a rapid and positive unlocking of the awl carrier and nail-plate slide y holder simultaneously with the locking ofthe awl carrier to the cross head. f

As the cross'head continues its downward motion, the stop member again contacts with the top 76 of the cam member 65, moving the `same down from its intermediate to its lowermost position, but without any effect upon the bolt 57, the latter already being held in retracted position, they parts being arranged as shown in Fig. 6 at the end of the spanking movement of the cross head. The cross head now moves upwardly into the position Shownl in 1,v it being noted, however, that by reason of the breaking of the toggle connection between the bell crank 43 and the rod 69, the nut V70 during such lupward movement of the cross head will contact with the lower extremity of the cam member 65 raising the same to such an extent as to permit bolt 57 to be moved into its projected position across the path of the" memberL 52 .by actuation of the spring 59, thus restoring the parts to initial position as shown in Fig.

y,From the above description, itwill be evident that upon alternate downward movements of the cross head the turret will b e swungV into nail-driving land spanking positions and-will be locked during substantially the whole time between actuations. yAs in certain cases it is desirable to Vperform two spanking movements in succession, it is necessary to provide for intermitting` such alter- 50.

nate operations yunder such circumstances, and for this purpose the lever member 79 has been provided. As will beV seen from inspection of Fig. 9, said lever A79, when raised into the horizontal dotted line position, will,- by*IV reason of engagement of its cam 80 with the face 81of the bracket 34E, cause a retracting movement of the bolt 57 regardless of the position of the cammember gagement of cam surfaces 64-`and 63, but being sufficient to remove the bolt from the pathof the rod 52. if now the operator desires to cause two spanking movements of the cross head in succession, he ywillV immediately after the first of such movements turn said lever 79 into horizontal position, where it will be temporarily retained by frictional engagement of the cam 80 with surface 81, thereby retracting said bolt and permitting the machine to perform a second sequence of operations similar to that shown in Figs. 4C, 5 and 6. As is clear, however, from Figs. 3 and 6, the final downward movement of the cross head always serves to move the cam member 65 to its downward limit 'of movement, thereby-fully retracting the bolt 57. The retractionof said bolt is sufficient to cause disengagement of the cam 80 from the surface 81, the weight of the lever 79 then acting to restore the latterto vertical position, the machine thus, onk the next downward movement rof the cross head, being free Lto take up its alternate series of operaltions.

From the above description, of the mechanism and its mode of operation, it willV be evident that the present invention provides automatic means for turning the turret from one to the other of its operative positions, thus relieving the operator of the necessity of turning the ,turret between each successive operation and enablinghim to devote his entire attentionl to the proper positioning ofy the'shoewith respect to the' nail-driving elements, such means, however, being controllable at the will of the operator whereby one of such operations may be repeated indelinitely, if desired.

It will also be noted that bythe employ-y mentof the above described mechanismfor locking the awl carrier to the nail-plate slide holder much of the uncertainty of operation of prior machines has been avoided, as well as the complication of structureV found necessary in such machines in attempting to avoid such uncertainty in .operation, the present mechanism providing a simple and efiicient device which ispositively operative under allcircumstances for" holding the awl carrier in proper retracted position during the nailing operation, but which is automatically and positively un? locked simultaneously with 'the locking of the awl carrier to the cross head for the 1 pricking operation.

While the above described mechanism is a preferred embodiment of the invention, it is to be understood thatY the invention is ynot to be restricted to the specific', details thereof, but ythat various changesy and modifications Vin the structure may. be made suchfras fall withinthe scope of the appended claims.

Having thus now described the invention togetherV with av specific embodiment of'th'ef same and themode of'operation thereof what I claim and-'desire to secure by Letters Pantent of the United States' is,-V

1. Ina heel nailing machi tion, ank oscillatable turret, mechanism conne, in combinastruc'ted and arranged automatically to swing said turret from oneoperative position to another, and means under control of the operator for intermitting the operation ofsaid mechanism while the machine is in operation. Y

2. -Ina heel nailing machine, Vin combination, an oscillatabler turret provided with heel nailing and spanking devices, automatically actuated means for turning said turret alternately; to nailing and spanking position, and means locking said turret in either of said positions during substantially the entire interval between the turns of said turret. Y

3. Ina heel nailing machine employing a turret having nailing and spanking devices carried thereby, in combination positively actuated mechanism forv turning said turret to position for operation of-one of said devices and resilient means for turning said turret to position for operation of the ,other of said devices. f

4. In a heel nailing machine having a lreciprocable cross head and an oscillatable turret carried thereby, a locking latch arranged to hold said turret in liXed position when said cross Vhead is stationary, means actingautomatically upon movement oi the i cross head for retracting said latch to rematically actuated cam means for retracting said latch.

6. Ina heel nailing machine having va reciprocable cross head and a turret carried thereby, in `combination, means actuatedV upon movement of the cross head for turning said turret, a latch forlocking said turret lin either of two positions, spring means for advancing said latch, and cam means for retracting said latch, 'said means comprising a cam element and a. roller for engaging the same, one of said engaging parts being carried by vthe latch and the other being krelatively fixed lwith respect to i the movement of the cross head.

\ v turret of a heel nailing machine of the type V7. In a locking device for the oscillating employing a reciprocating cross. head', a

i latch ladapted 'to have locking engagement with4 the turret in either of' two positions 'of V,the latter, a cam carried by the latch,

and a' roller lfor engaging said4 cam andY I' mounted upon a Xed part of the-machine.

8. In a heel nailinggmachine having la re- .cipro'catory cross head and an oscillatable turret carried thereby, in combination, a

`said cam upon upward movement of the cross head. A

9. In a heel nailing machine having aV reciprocable cross head anda turret mounted thereon, means for turning said turret comprising a slidable rod, and .a retractf able bolt normally projectedacross the path of said rod for limiting the sliding movement thereof. y

10. In a heel nailing machine having'a` reciprocable cross head and a turret oscillatable thereon, means for oscillating said turret comprising a'rod vertically slidable in fixedy bearings, a stop member movable into the path of said rod toflimit the movementor the same and means for automatically moving said stop member into and out ofthe-path of said rod upon alternate reciprocations of the crosshead.

11. In a Vheel nailing machine having a reciprocable cross head and an oscillatable turret carried thereby, in oombinatiommeans for oscillating said turret comprising a crank -arm carried thereby, a ball Vcrank lever pivoted to the crosshead, a linkconnecting the crank arm and one arm of the bell crank lever, la vertically slidable rod connected to the other arm of said lever, and means VVfor limiting the sliding movement of saidV rod,` whereby downward reciprocation of `the cross head serves to swing said bell crank'y and thereby to turn the turret. Y i i 12. In ay .heel nailingV machine `having a reciprocable cross head anda turret carried thereby, in4 combination, means for lturn-,- ing said turret comprising a slidable rod, a slidablebolt, spring means for projecting said bolttransversely across the path of said rod, means normallyoperative upon alternate reciprocations of the cross head to retract said boltout of the path of said ret oscillatable thereon, in combination, f

meansv for .oscillatinglsaid turret compris? ing a bellfcrank lever'mounted upon the cross head and having connections with the turret, `an element guided for movement` upon the machine frame and connected to said bell crank lever, means-movable across the path of said element-for limiting the movement of the same, connections between said bell crank and said means for moving the latter into and out of the path of said element upon alternate reeipr'ocations of the cross head, and a manually'operated device for moving said limiting means out of such path at Will.

14. In a heel nailing machine, a turret turnable in opposite directions into either nail driving or spanking position, in combination, means for turning lsaid turret from one of said positions to the other comprising a resilient member having operative connection With the turret, means for tensioning said resilient member and for holding the same under tension, and means for releasing said resilient member to thereby permit the same to turn the turret.

15. In a heel nailing machine having a reciprocable cross head and a turret oscillatable thereon, in combination, means for oscillating said turret comprising a crank arm ixed to said turret, a bell crank lever pivoted to the cross head, a link rod connecting said arm and lever, a bracket fixed to the cross head and having a guiding opening for said link rod, an adjustable stop member carried by said rod and a coil spring surrounding said rod and having its ends bearing against said bracket and said stop member respectively.

16. In a heel nailing machine a reciprocable cross head, a turret oscillatable thereon and having fixed thereto a crank arm and a member providing a pair of latch engaging openings, a latch for engaging either of said openings, a bell-crank lever pivoted to the cross head, a link rod connecting said lever and crank arm, a coil spring encircling said link rod and having engagement at opposite ends with a fixed abutment and a stopmember on said link rod respectively, a slide rod pivotally connected to said bell crank lever, ixed guiding means for said rod, a stop bolt slidable across and resiliently positioned in the path of said slide rod,y and mechanism including a toggle connection and a slide cam member for retracting said bolt upon alternate reciprocations of the cross head.

17 In a heel nailing machine having a repositively locking said aWl carrier to the cross head, and mechanismvfor automatically and alternately moving the respective locking means into locking position.

19. In a heel nailing machine having a reciprocable cross head and an aWl carrier slidable Withrespect thereto, a bolt for positively locking said aWl carrier in inoperative position, and a second bolt for locking said aWl carrier to the cross head, locking movement of said second bolt acting to move said first bolt out of locking position.

20. In a heel nailing machine having a reciprocable cross head and a nail-plate slide holder, in combination, an avvl carrier slidably mounted between said head and holder, said aWl carrier being provided With an opening therethrough, a bolt slidable in said nail-plate slide holder and arranged to be projected into locking engagement With said opening, a spring for projecting said bolt, and means for positively retracting said bolt.

21. In a heel nailing machine having a relatively fixed part and an avvl carrier slidable Withrespect thereto and provided With a bolt-receiving opening, means Jfor locking said avvl carrier to said relatively fixed part, comprising a spring projected bolt, said bolt having a cylindrical head arranged to have locking engagement With said opening in the awl carrier, and a suhstantially conical end portion.

22. In a heel nailing machine having a nail-plate slide holder and an aWl carrier slidable with respect thereto, in combination, means for normally' locking said avvl carrier to said holder, comprising a springpressed bolt having a part arranged for positive locking engagement With said avvl carrier, means for partially retracting said bolt to disengage said part from the avvl carrier, and means for completing the retraction of the bolt.

28. In a heel nailing machine having a reciprocable cross head and an oscillatable.,

turret carried therebv, an awl carrier slidable with respect to the cross head, a springpressed boltV for locking said aWl carrier in inoperative position, a second bolt for locking said avvl ,carrier to the cross head Jfor actuation thereby, andV cam means active upon turning of the turret for moving said second bolt, movement of said latter bolt into locking position serving automatically to cause disengagement of said first bolt from the aWl carrier. j

Y 24. Ina heel nailing machine, incombination, a reciprocable cross head, a nail-plate slide holder and an aWl carrier, said parts Vbeing' arranged for relative sliding movement and each being provided With an opening, said openings being in alinement when the respective parts are in normal position, a spring-pressed bolt slidable in the opening in the naillplate slide holder and engageable Within the opening in the awl carrier, a seoond bolt slidable in the opening n the cross head and engagea-ble With the opening -n the awl carrier, and Ineens for 4projecting l said second bolt into said latter opening,

Contact of said second bolt yWith the first bolt serving to cause movementY of the latten ont` of looking engagement with the wvl carrier opening. Y 10 In testimony WhereoyI have signed my namefto this specification.

JOHN T. LANCASTER.. 

